Assorted sized screw threads set into a board with nuts for sorting and screwing on and off. The board has insets for sorting nuts into, encouraging finger activity and manual dexterity. One Screw Board 16 x 8cm E0042 Two Screw Board 16 x 16cm E0041 Three Screw Board 16 x 24 cm E0040 Eligible for VAT Exemption